Generally, sources are divided into three main classes, which are continuous source, recyclable source and unrecyclable source. Most of the energy source comes from coal, petroleum and natural gas. Coal, petroleum and natural gas are unrecyclable and hence cannot be used again.
Petroleum is the most important energy source for most of the countries in the world. As we know, petroleum is needed as fuel for most vehicles on the road, for instance cars and motorcycles. Petroleum is also the raw material needed to produce plastic, and hence is used in the production of plastic materials such as toys. In the year 1990, the world’s main petroleum producer is the CIS (Commonwealth of Independent States). Some of the other petroleum producers in the world are Baltic nations, Georgia, the United States, Saudi Arabia, China, Iran, Mexico, Venezuela and Canada.
Natural gas is another important energy source. It is used for cooking and also to form an energy source for aircrafts. However, because of its low density, storage and transportation is a concern. In 1990, the main producer of natural gas is the CIS. The Baltic nations, Georgia, the United States, West of Europe, West of Asia, China, Africa and Canada are gas producers too.
Coal is one of the oldest energy sources. In the early 20th century, coal supports 90% of the world’s energy. Now using coal for energy is going rock bottom. Not many countries are using coal for their power source nowadays. The quality of coal depends on the quantity of the carbon and the quantity of its vapor. Coal is used in many ways such as cooking and burning.
Electric energy is divided into two. One of them is hydroelectric energy and the other is the energy from heat. Hydroelectric is generated using a hydro turbine and water. This form of energy has been used to grind corn since many years ago. Hydroelectric energy is recyclable and can generate energy continuously. Heat energy is generated from burning coal or woods in a heat power plant.
Petroleum, natural gas and coal are unrecyclable, so a handful of countries are lowering their usage and finding alternative energy sources for their country. Nuclear power, solar power, wind power, tide power and geothermal energy are some examples of alternative sources of energy that are emerging.